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Yes, I just noticed that too.
I think dvduval is right, the results are from Yahoo Inktomi but I can't recall if they were ever once so similar to one another for Yahoo and MSN like this time.
It looks like MSN has dropped its own former calculating ingredients and use that of Yahoo instead.
The current MSN serp is different from those in tech preview.
So, in highly competative industries which utlize PFI, there is going to be a difference in results where as industries which don't utlize PFI, the results will be closer.
I have not seen any real hard evidence of this however.
Depending the the keyword(s) used, could this difference be contribued to the way MSN handles stemming versus Yahoo!? If Yahoo! uses a more aggresive (if that is the right word) stemming approach than MSN, you would naturally see a larger set of results.
Just an idea.
I have a site that went missing from Yahoo! last weekend (banned I suppose, yawn..), it is however still in MSN in the same position.
I fully expect it to be missing from MSN in the comming days/weeks.
We'll see if I'm right.
But a also agree that the other search.msn.com index is an older version of Yahoo.
That being said some of Yahoo's data last week was older than that it had supplied to MSN.
don't you just love this game :)